# calculate the difference on the antenna azimuth

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michael on 7 Jun 2021
Edited: Aparajith Raghuvir on 7 Jun 2021
Hi,
I need to calculate the difference of 2 azimuths (lets say analytical and real azimuth).
There is no issue if both are preatty close in between 0 and 360-eps.
The problem begins if one of them is on the other side of the 0 - if I have analytical to be 359 and actual is 1, the diff is 2 degree. If I'll calculate (analytical - actual) I'll get 358 and if I'll calculate (actual-analytical) I'll get -358 which is wrong for both cases.
Is there some convinient way to do the calculation so that the sign will also be avilable (i.e. who is bigger)

Aparajith Raghuvir on 7 Jun 2021
Edited: Aparajith Raghuvir on 7 Jun 2021
Hello Michael,
Given an angle A in degrees, the signed angle is
(A + 180) modulo 360 - 180
The difference between two angles, as in your requirement, can be found as follows:
abs(mod((a1+180), 360) - mod((b1+180), 360))
where a1, b1, are the two angles in consideration.
Hope this helps.
Thanks,
Aparajith

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